priority hints and callback names with func keyword

[cooper]

func enterBar {
    need $name: Str
    say("Welcome $name.")
}

func enterBar before :default, :checkID {
    want $age: Int = 0
    if $age >= 21
        return
    fail Error(:UnderageError, "sorry...")
    stop # cancel all remaining callbacks
}

[cooper]

Maybe having two keywords func and on is too confusing? I could get rid of on... or maybe that would be even more confusing.

If I did get rid of on, func would have to accept any expression as its argument, and in the case of a bareword, it would have to create a new event if the bareword evaluated to undefined (as on currently does).